44-year-old Ayaiko is trapped in a one-sided relationship with her husband, leaving her emotionally unfulfilled. Into this loneliness steps her son, who begins harboring sexual feelings for her. Ayaiko finds herself responding, moaning repeatedly under her son's touch as she craves satisfying his desires. Enthralled by his skill, she loses control of her own urges. As their emotional bond deepens, they cross into forbidden territory. Unable to resist their mutual impulses, mother and son plunge into the silent, taboo world of incest.